Patriot Viper Series DDR3-1600 8-8-8-24 XMP Ready Triple Channel Memory Kit
Author: Frank Stroupe
Editor: Shawn Knight
Date: 11-22-2009
Provided by: Patriot Memory

Test Rig:

Intel Core i7 860 LGA 1156 processor
ASRock P55 Deluxe Intel P55 motherboard
Sapphire Radeon HD 5850 video card
OCZ Z Series 650 Watt power supply
Cooler Master Hyper 212 Plus CPU cooler
Ikonik Zaria midtower
Windows Vista Ultimate 64-bit SP2

Rather than using all three Patriot Viper DDR3-1600 modules in my X58 rig, which is currently indisposed, I will be using two of them in my P55 rig. Patriot has a dual channel low voltage kit with the same specs as this memory, but in a different product line, so there is no need to buy a triple channel kit for your P55 board.

The LGA 1156/P55 has the exact same memory specifications as the LGA 1366/X58, DDR3 memory that use a max Vdimm of 1.65v. DO NOT RUN MEMORY ON P55/X58 MOTHERBOARDS AT MORE THAN 1.65v!!! YOU WILL DAMAGE THE ONBOARD MEMORY CONTROLLER ON THE i7/i5 PROCESSOR! Every X58 and P55 BIOS I have seen so far gives you a warning. This damage may be gradual, it may be immediate. It is unlikely you will be able to RMA a processor that has seen memory overvolting. It just isn't worth taking that chance.

Of course physically installing the memory involves only popping the modules into the motherboard's memory slots. Though a significant difference with Intel X58 and Intel P55 motherboards is that you will not use the memory slot closest to the CPU unless you are using the maximum number of memory modules, or using an odd number of modules (such as three with the P55 or four with the X58). DIMM_1 or DDR3_1 will always be the memory slot that is located closest to the forward edge of the motherboard, and you will use every other slot as with LGA 775 boards.

The Viper Series DDR3-1600 is Intel XMP (Extreme Memory Profile) ready, the SPD setting of DDR3-1600 8-8-8-24 at 1.65v is already flashed onto the memory. If XMP is enabled in your board's BIOS, you won't have to go into the BIOS to set the speed, timings, and Vdimm.

Be aware that your board may not have XMP enabled by default. If it doesn't, the memory will likely boot at DDR3-1333 or DDR3-1066. This is so that if there are adjustments that need to be made to get the board to run at the advertised speed, such as overclocking the CPU or adjusting the Vdimm, the rig will POST to allow you to make them. The memory's SPD cannot make those adjustments, and if they need to be made, the rig will not POST. This has been the standard for a few years, yet I still see complaints in hardware forums and user reviews about it.

As my board's XMP was enabled by default, the memory booted up at advertised speed. Actually, rather than DDR3-1600, it was running DDR3-1647. It wasn't the fault of my board as I have had another DDR3-1600 kit and it didn't. And it wasn't CPUZ, as the memory was read at DDR3-1647 at POST.

I assume that the speed was a result of the higher number being flashed onto the SPD by mistake. Since XMP cannot be disabled on my motherboard I was unable to check to see if I could merely manually set the speed to DDR3-1600, but I guess that anytime the speed is at 1600, the XMP kicks in.

It was a little odd, but no problem whatsoever. Everything ran just fine.

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